factors like smoking, age, and obesity, the report concludes there is likely an association between hair loss and heart disease. it's this type of male baldness that is getting the attention. the hair loss starts on the crown of the head and slowly spreads. the men in this category showed the highest risk of heart disease. and the bigger that bald spot, the higher the risk. >> i wanted to go over your labs with you. >> terrific. >> reporter: jerry was barely out of his teens when he started losing his hair. >> i thought, oh, my god, this is the end of the world. >> reporter: he's now 59 and also has heart disease. >> had i known then what i know now i probably would have been more vigilant. >> reporter: while researchers aren't sure exactly why there seems to be a connection, they say it could be an important starting point for conversations about reducing other risk factors. an important clue that might help doctors detect problems before cardiac complications. dr. nancy snyderman, nbc news, new york.